可见光通信极性索引正交频分复用技术研究

发布时间：2018-05-28 01:21

本文选题：非线性限幅失真 + 极性索引正交频分复用(PIM-DFDM)　；参考：《光电子·激光》2015年03期

【摘要】：为了抑制可见光通信(VLC)正交频分复用(OFDM)系统发光二极管(LED)非线性限幅失真,提出了一种极性索引OFDM(PIM-OFDM)调制方式。PIM-OFDM通过两个模块分别传输直流偏置光OFDM(DCO-OFDM)双极性信号的极性信息和幅度信息。在第1模块中,对双极性信号的正负极性编码并使用OOK信号传输。在第2模块中,对双极性信号取绝对值得到幅度信息。在相同条件下,PIM-OFDM系统性能比非对称限幅OFDM(ACO-OFDM)系统提升了接近3dB。在光功率约束条件下,在最大有效(SNR)原则下得到了直流偏置和输入信号的最优功率分配。仿真结果表明:光功率约束较小时,有效SNR随着直流偏置增大而变小;光功率约束较大时,有效SNR随着直流偏置增大会先增大后减小。实验结果表明:在相同传输速率的情况下,PIM-OFDM误码率(BER)性能要比ACO-OFDM提升1个数量级。
[Abstract]:In order to suppress the nonlinear amplitude limiting distortion of LED in VLC (orthogonal Frequency Division Multiplexing) OFDM (OFDM) system of visible light communication, A polarity index (OFDM) PIM-OFDM modulation scheme .PIM-OFDM is proposed to transmit the polarity information and amplitude information of DC biased OFDM OFDM DCO-OFDM signals respectively. In the first module, the positive and negative polarity of the bipolar signal is encoded and transmitted using the OOK signal. In the second module, the bipolar signal is absolutely worth the amplitude information. Under the same conditions, the performance of PIM-OFDM systems is nearly 3 dB higher than that of asymmetric limiting OFDM ACO-OFDM systems. Under the condition of optical power constraint, the optimal power distribution of DC bias and input signal is obtained under the principle of maximum effective SNR. The simulation results show that the effective SNR decreases with the increase of DC bias when the optical power constraint is small, and the effective SNR increases first and then decreases with the increase of DC bias when the optical power constraint is large. The experimental results show that the BER performance of PIM-OFDM is one order of magnitude higher than that of ACO-OFDM at the same transmission rate.
【作者单位】：解放军信息工程大学;
【基金】：国家自然科学基金(61271253) 国家“863”计划(2013AA013603)资助项目
【分类号】：TN929.1

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